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active injection protection scheme for flexible HVDC grids based on amplitude of input impedance

Global Energy Interconnection 2021年第6期4卷 531-542页

作者： Jinghan He Keao Chen Meng Li Yong Tang Ming Nie Beijing Jiaotong University Haidian DistrictBeijing 100044P.R.China China Electric Power Research Institute Haidian DistrictBeijing 100192P.R.China

High-voltage direct current(HVDC)grids require fast and reliable protection of the DC *** performance of traditional protection schemes is easily impaired by the limitations of the boundary condition and nonlinearity from the control of *** of the key technologies for flexible HVDC grids is the half-bridge modular multilevel converter(HB-MMC).Considering the high controllability of HB-MMC,this study proposes an active injection protection scheme to improve the reliability and sensitivity of the HVDC grid *** HB-MMC is used to inject a sinusoidal characteristic signal,at the specified frequency,into the DC ***,the voltage and current at the specified frequency are extracted using the Prony algorithm to calculate the input impedance,which is used for the identification of internal and external *** active injection protection scheme was simulated for various cases in the simulation software Power Systems Computer Aided *** simulation results indicate that the proposed protection scheme is highly reliable and can overcome transition resistance.

关键词： HB-MMC Flexible HVDC grids active injection Characteristic signal Input impedance

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Research on DC Protection Strategy in Multi-Terminal Hybrid HVDC System

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Engineering 2021年第8期7卷 1064-1075页

作者： Yuping Zheng Jiawei He Bin Li Tonghua Wua Wei Dai Ye Li State Key Laboratory of Smart Grid Protection and Control State Grid Electric Power Research Institute(NARI Group Corporation)Nanjing 211106China Key Laboratory of Smart Grid of Ministry of Education Tianjin UniversityTianjin 300072China College of Energy and Electrical Engineering Hohai UniversityNanjing 210098China

Multi-terminal hybrid high-voltage direct current(HVDC)systems have been developed quickly in recent years in power transmission ***,for voltage-source converter(VSC)stations in hybrid HVDC systems,no direct current(DC)filters are *** addition,the DC reactor is also not installed at the line end because the DC fault can be limited by the converter *** means that the boundary element at the line end is absent,and the single-ended protections used in line commutated converter(LCC)based HVDC(LCC-HVDC)systems or VSC-HVDC systems cannot distinguish the fault line in multi-terminal hybrid HVDC *** paper proposes a novel singleended DC protection strategy suitable for the multi-terminal hybrid HVDC system,which mainly applies the transient information and active injection concept to detect and distinguish the fault *** with the single-ended protections used in LCC-HVDC and VSC-HVDC systems,the proposed protection strategy is not dependent on the line boundary element and is thus suitable for the multiterminal hybrid HVDC *** corresponding simulation cases based on power systems computer aided design(PSCAD)/electromagnetic transients including DC(EMTDC)are carried out to verify the superiority of the proposed protection.

关键词： Multi-terminal hybrid HVDC system Single-ended protection Transient information active injection

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